Pipe coil heat exchange equipment



- Nqv; 24, 1931.

w. H. M GRATH PIPE COIL HEAT EXCHANGE EQUIPMENT 2 SheetS-Sheet 1 anowbo'c Filed Jan. 31, 1929 7 :hi J i. 752$55572555.23!"- 5525 I252! 35!, FF

. u u E 4 NOV. 24, 1931. w, MCGRATH PIPE COIL HEAT EXCHANGE EQUIPMENT PM Nov. 24, 19:11

PATENT OFFICE UNITED STATES magmleomormamnmmassmuonmsrmm OIL nlmorm'r comm, A common OF DELAWARE rrracomrmarmenm ammrnuu anunamnnmmo.

This invention relates to improvements in tubular heat of the type inwhichbafllesamplacedinthefluidstream. Numerous forms ofsuch equipment have heretofore been proposed with a view to obtaining thorough tact of fluid with the tube walls. Principal objects of the present invention are to provide simple and efiective means comprising internal and external pi with baflle means in 've relation to the pipes. In a p erred form of the improvements described herein, the bullies are readily removable for cleaning.

The invention will be fully understood from the following description read in con; nection with the accompanying drawings, in which 7 Fig. 1 is a fragmentary perspective view showing the parts in withdrawn position;

Fig.2isaverticalsectionthroughthe outer and inner pipes;

Fig. 3 is an end view of the inner pipe;

Fig. 4 is a side .elevation of a preferred type of return bend;

Fig. 5 is an end elevation of the same;

Fig. 6 is a side elevation, partly in section, showing a horizontal arrangement of the exchanger;

Fig. '7 is a diagrammatic side elevation showing the utilization of a vertical form of the equipment in connection with an oil still; and

8 is a view similar to Fig. 1, showing a modified form.

Referring to the 1 denotes an outer pipe and 2 a smaller pipe therein. A helical baflle 1s secured to the pipe 2, preferably by welding, though it may be secured by removable means such as bolts and nuts. Bafile 3 is of such size as to hold pipe 2 concentrically in pipe 1. A helical baflle 4, mounted on a rod 5, is adapted to fit snugly in pipe 2.

The outer pipe 1 has an outwardly extendingannularflangefiatoneendandacorrespondingflange? atthe otherend. Flange fiisrecemedatfi'onitsinner toreeeive lugs 8 formed at the end of inner pipe 2. Flangesfiand'lhaveannulargrooves9 mixing and eflicient con to receive a correspondingl sha ton e 10 on a return bend 11. portions 12, 12', on pipe 2 also have annular grooves 13, adapted to receive :1. correspondmgly shaped tongue 14 on return bend 11. Itwillbenotedthatthercturnbendhasinner and outer "es 1, 2', correspondmg to pipes 1 and 2, so that liquids flowing H these pipes do not at any time come into direct contact with each other.

Flanges15onthereturnbendaresecured toflangesfiandtoflanges'Ton adjacentsectlons of pipes 1, by bolts and nuts or other readily removable means, not shown. Bolt holes 16 may be provided in the 15 to corapgate with bolt holes 16' in flanges 6 m -i In assembling theequi ment, rod 5 carryingbafle4isrunintopipe2andthenthis plpe is inserted in pipe lso that lugs 8 are seatedinrecessesfi'. Returnbends 11 are next secured to adjacent sections. It will be seen that the assembly and disassembly are easily accomplished, which is a-great advantage, especially if the 'pment is to be used with oils or other liquywhich may foul the heat exchange surfaces and necesitate frequent cleaning.

In Fig. 6 I have illustrated the use of my device for simple conntercurrent heat exbetween two liquids. The inlet for the Chang. e hqu d entering the Inner-pass is at 1'7. Theqmd in the outer pass flows in the opposite Y direction and discharges at 18. While countereurrent flow is generally desirable, both liquids may of course flow in the same direction. The equipment may be heated or cooled in any suitable way.

Fig. 7 shows the improved heat exchanger vertically and connected by a vapor line 19 to a still 20. Feed oil is supplied to the still through line 21 which by branches and 23, respectively, to a terminal section 24 and an intermediate section 25 of the heat equipment. Lines 26 and 26' convey the preheated oil to the still. Suitable valves are in the lines so that ge' flow of oil tdhrough the ex changer may regulated as eslred.

In the installation shown, the feed oil passes through the inner pipes and the vapors and return bends detachably connecting adpass through the outer ipes. Condensates jacent units, each bend having an annular may be taken off throug lines 27 and 28 to passage and an inner passage communicating suitable cooling coils 29 and 30. Any vapors with correspondin passages of the units.

leaving the terminal section 24 pass through a line 31 into a cooling coil 32. A draw-off line 33 conveys condensate from the terminal section 24 into a line 34 which is connected with the draw-off lines 27, 28 and 31. Valves are provided in these lines to permit the routing of the condensate in any desired manner.

I prefer to use baflies in a true helical form but this is not an essential of the invention. Any bafile means which will insure adequate mixing of the liquid passing through the tube and effective contact of the liquid with the tube walls may be used in the improved equipment. For example, one alternative form of bafiie is .shown in Fig. 8 in which plates 35 are mounted .on pipe 36 and have cut away portions 36 oppositely arranged to compel circuitous flow of liquid outward into contact with the tube walls. Similar baffles 37, having cut away portions 37 are mounted on a rod 38 adapted for insertion in an inner pipe 39.

Instead of the arrangement shown for installing the baflles, any other means may be provided which will permit the removal of the battles for cleaning.

The construction described is preferred but it will be understood that various changes and alternative arrangements may be made within the scope of the appended claims, in which it is my intention to claim all novelty inherent in the invention as broadly as the prior art permits.

I claim:

1. Heat exchange equipment comprising an outer pipe, an inner pipe in spaced relation thereto, a return bend having outer and inner passageways detachably connected respectively to the outer and inner pipes, and baflie means operatively arranged with respect to both the inner and outer pipes.

2. Heat exchange equipment comprising a plurality of condenser units including pipes concentrically disposed to form an annular passage and an inner passage, a spiral baffle in the annular passage, a spiral bafiie detachably supported in the inner passage, the inner pipe being detachably supported in the outer pipe, and return bends detachably connecting adjacentunits, each 'bend having an annular passage and an inner passage communicating with the corresponding passages of the units.

3. Heat exchange equipment comprising a plurality of condenser units including pipes concentrically disposed to form an annular passage and an inner passage, a spiral baffle inthe a'nnular passage, a spiral baflie detachably supported in the inner passage, the inner pipe bemg suspended freely in the outer pipe,

WIL IAM H. MoGRATH. o 

